Question

(20 Points)

Which conjunction or disjunction is equivalent to following open sentence?

`|\alpha - 9|\leq 4`

A.
`\alpha - 9 \geq 4` and
`\alpha - 9 \leq 4`

B.
`\alpha - 9 \leq 4` or
`\alpha - 9 \geq -4`

C.
`\alpha - 9 \leq 4` and
`\alpha - 9 \leq -4`

D.
`\alpha - 9 \leq 4` and
`\alpha - 9 \geq -4`

Answer 1

|a-9|<=4

a-9 <=4 and a-9>=-4

Choice D